［iOS备忘录］UITextView多行输入，键盘隐藏问题[swift]

使用UITextView进行多行输入，输入完毕后关闭键盘

UIScrollView与UITextView配合使用，可实现多行输入。

       var msgText: UITextView!
       let sc = UIScrollView()

override func viewDidLoad() {
        super.viewDidLoad()

        let notificationCenter = NSNotificationCenter.defaultCenter()
        notificationCenter.addObserver(self, selector: "handleKeyboardWillShowNotification:", name:      

                        UIKeyboardWillShowNotification, object: nil)
        notificationCenter.addObserver(self, selector: "handleKeyboardWillHideNotification:", name:

                        UIKeyboardWillHideNotification, object: nil)

        // scroll
        sc.frame = self.view.frame
        sc.delegate = self
        sc.contentSize = CGSize(width: 250,height: 150)
        self.view.addSubview(sc);

      
        msgText = UITextView(frame: CGRectMake(10, screenHeight-100, width-20, 40))
        msgText.editable = true
        msgText.layer.masksToBounds = true
        msgText.layer.cornerRadius = 10.0
        msgText.layer.borderWidth = 1
        msgText.layer.borderColor = UIColor.lightGrayColor().CGColor
        msgText.font = UIFont.systemFontOfSize(CGFloat(20))
        self.view.addSubview(msgText)
        
        // 关闭键盘的按钮
        let accessoryView: UIView = UIView(frame: CGRectMake(0, 0, 210, 40))
        accessoryView.backgroundColor = UIColor.clearColor()
        
        let closeBtn = UIButton.buttonWithType(UIButtonType.System) as! UIButton
        closeBtn.frame = CGRectMake(210, 10, width-100, 30)
        closeBtn.setTitle("閉じる", forState: .Normal)
        closeBtn.addTarget(self, action: "closeBtnClicked", forControlEvents: UIControlEvents.TouchUpInside)
        accessoryView.addSubview(closeBtn)
        msgText.inputAccessoryView = accessoryView

        sc.addSubview(msgText)

｝

func handleKeyboardWillShowNotification(notification: NSNotification) {
        
        let userInfo = notification.userInfo!
        let keyboardScreenEndFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()
        let myBoundSize: CGSize = UIScreen.mainScreen().bounds.size
        var txtLimit = msgText.frame.origin.y + msgText.frame.height + 8.0
        //var btnLimit = sendBtn.frame.origin.y + sendBtn.frame.height
        let kbdLimit = myBoundSize.height - keyboardScreenEndFrame.size.height
       
         if txtLimit >= kbdLimit {
        //if btnLimit >= kbdLimit {
            sc.contentOffset.y = btnLimit - kbdLimit
        }
    }
    
    func handleKeyboardWillHideNotification(notification: NSNotification) {
        sc.contentOffset.y = 0
    }

如果设置了按钮需要按钮与输入栏一起联动的话，需要将按钮也添加到scroll里，并修改limit（btnLimit）即可。